100% Polyester, OSFM: 7 7/8” W x 5” H, Non-Medical Grade & Non-Surgical. Not certified Personal Protective Equipment (PPE).All sales final. No returns. No refunds.. Antibacterial; Water Repellent; Moisture Wicking; Washable & Reusable; Double layer protection; Soft & Comfortable; Adjustable Silicone knob w/elastic ear loops